From 8a19cb586708361058e089b7c23b6f3eb33af6c6 Mon Sep 17 00:00:00 2001 From: Thomas Renninger Date: Tue, 13 May 2014 12:41:43 +0200 Subject: [PATCH] cpupower: If root, try to load msr driver on x86 if /dev/cpu/0/msr is not available Signed-off-by: Thomas Renninger Signed-off-by: Rafael J. Wysocki --- tools/power/cpupower/utils/cpupower.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/tools/power/cpupower/utils/cpupower.c b/tools/power/cpupower/utils/cpupower.c index 7efc570ffbaa..7cdcf88659c7 100644 --- a/tools/power/cpupower/utils/cpupower.c +++ b/tools/power/cpupower/utils/cpupower.c @@ -12,6 +12,9 @@ #include #include #include +#include +#include +#include #include "builtin.h" #include "helpers/helpers.h" @@ -169,6 +172,8 @@ int main(int argc, const char *argv[]) { const char *cmd; unsigned int i, ret; + struct stat statbuf; + struct utsname uts; cpus_chosen = bitmask_alloc(sysconf(_SC_NPROCESSORS_CONF)); @@ -195,6 +200,15 @@ int main(int argc, const char *argv[]) get_cpu_info(0, &cpupower_cpu_info); run_as_root = !getuid(); + if (run_as_root) { + ret = uname(&uts); + if (!ret && !strcmp(uts.machine, "x86_64") && + stat("/dev/cpu/0/msr", &statbuf) != 0) { + if (system("modprobe msr") == -1) + fprintf(stderr, _("MSR access not available.\n")); + } + } + for (i = 0; i < ARRAY_SIZE(commands); i++) { struct cmd_struct *p = commands + i; -- 2.39.5